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40mph RC for a 3 year old? NOT a good idea. I would do way more than the tranny flip and lower gearing. Get a brushed esc and a 380 size crawler motor. (Keep the brushless setup for you or an upgrade several years down the road) And on top of that adjust the end points on your throttle down to say 10%. With the end point adjustment you should be able to get it down so it will barely move at full throttle.

dont think an 11T will fit. Motor will probably hit the receiver box, tho i havnt tried that small, smallest i have is 16.
Flip tranny, gear it 55-16, put in training mode and LOOSEN THE SLIPPER CLUTCH so it dont wheelie so easy. Still going to be twitchy as on take off. u could try 55-21 or 23 with fliped tranny. Not so twitchy on take off, BUT a slightly higher top speed, prob not good for a little tacker and surrounding walls

btw, i thought id add this for an indicator between flipped and not flipped. i havnt tried tranning mode with a flipped tranny but my missus merv is in tranning mode, 50-21 with standard gearbox (not flipped) and it goes as quick as my summit with flipped tranny and 45-23 gearing.
Saying that, i rekon a flipped tranny, geared as low as you can go and in training mode should dramaticaly slow the truck down. i do rekon its still going to wheelie on take off, especially at the rate a little guys going to mash the throttel. Trim your throttel end like mentioned above in an earlier post.

The tranny flip will give you a 9.72 reduction where the stock is 5.04(number in the manual) with the tranny and diffs taken together. With a 12T pinion which is available since the shaft is practically 1/8" from RRP or similar you can get down to a 44.55 ratio with the 55T spur. Top speed of approx 16 mph at 50,000rpm. We just tried this set up with the stock 16T pinion and it was awesome. At first we had some tranny noise(we thought) but diagnosed it to a pinion/spur mesh that was too tight. After we adjusted properly things were great.

Super glue an eraser nub from a #2 pencil or use a cabinet bump stop behind the trigger instant throttle reduction n not too much punch. I did this on a custom paint marker setup to control trigger rebound time on a single pull shot set up.

Not sure if you're still following this thread or not, but I wanted to say, if you use a stock NiMh battery instead of the 2s, you'll see slower speeds - VERY NOTICABLE! Not sure the tranny swap was necessary but hey, cant hurt.

stock battery, training mode, and 55 spur with as small of a pinion gear as you can find that fits. You're local hobby shop SHOULD have a variety that will fit.

Not sure if you're still following this thread or not, but I wanted to say, if you use a stock NiMh battery instead of the 2s, you'll see slower speeds - VERY NOTICABLE! Not sure the tranny swap was necessary but hey, cant hurt
Hope all works out for you guys - Congrats and good luck

Thank u ffor the simple reply of using the stock batt.

Trany filp is noisy they say this truck is noisy in stock config.

To many times we go way over board trying to fix a problem. Trany flip. Way to far

After controling rc helios airboats carpet racers to crawlers for over 25 years
i teach this throttle control methed raise your grip till the middle finger is up and under the trigger
Use the training mode if aval
Use your finger to slow or retart the pull it is really cheap you can and i have taped the finger inplace the
Pistol grips need an ajustable grip.

Wish we could just KISS and **** ppl start using turn signels keep is simple and learn how to fix it for free.
Keep it simple and Free.